Carbon dioxide levels reached their highest levels on record during an event that occurred decades ago. Specifically, atmospheric CO2 levels have been steadily increasing since the Industrial Revolution in the late 18th century, with significant milestones reaching beyond 400 parts per million in recent years, particularly noted after 2013.
When did carbon dioxide levels reach their highest levels on record?
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1 point
Event that occurred billions or millions of years ago
Event that occurred thousands of years ago
Event that occurred decades ago
1 answer